3PCS Piston Head O-RING FOR Ver.2/3 Gearbox

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- Essential part for upgrading your Airsoft  AEG and GEL BLASTER
Most Airsoft  AEG and blasters come with average O-rings as standard, if you want more power, one of the most important upgrades is the O-Ring.
This O-Ring is slightly larger diameter which will help increase the air seal in your cylinder.
Manufacturer: COOLHOBBY
Fit for Version 2/3 Gear Box
Qty: 3pc